(US4874678-A)      Flat cross-section, solid oxide electrolyte, electrochemical cell configuration is axially elongated and contains a porous air electrode (2) with a number of interior gas feed chambers (3) through its cross section and parallel to its length. Ratio of cross sectional thickness of air electrode to width of non-porous interconnection (6) is 1:4-50.    Air electrode is oxidic pref. LaMnO3 doped with Sr while interconnection is of La chromite doped with Ca, Sr, or Mg. Interconnection coverage is 60-100%, pref. 75-95% of an electrode width. Balance of electrode surface is covered by gas-tight solid electrolyte (5), contacted by a porous fuel electrode anode (8). Flexible porous metal fibre connection fats (9) connect the cell to other cells in series.    ADVANTAGE -   Thermal stresses in operation are releived by flexible structure.    (DE3874498-G)      High-temp. solid electrolyte flat cell stack includes: an inner electrode (2) with interior gas supply conduits (3) along its axial length; electrolyte (5) contacting the inner electrode; and an exterior electrode (8) contacting the electrolyte. A major portion of the inner electrode top surface (7) is covered by an interconnect material (6) and each cell has at least one elongated, conductive, flexible, porous, metal fibre strip (9) connected to the inner electrode via the interconnect material.    ADVANTAGE -   Use of metal fibre current collector in a flat plate configuration permits the stack to be started up and operated without sensitivity to thermal gradients and mechanical stresses.    (JP2947557-B2)      High-temp. solid electrolyte flat cell stack includes: an inner electrode (2) with interior gas supply conduits (3) along its axial length; electrolyte (5) contacting the inner electrode; and an exterior electrode (8) contacting the electrolyte. A major portion of the inner electrode top surface (7) is covered by an interconnect material (6) and each cell has at least one elongated, conductive, flexible, porous, metal fibre strip (9) connected to the inner electrode via the interconnect material.    ADVANTAGE -   Use of metal fibre current collector in a flat plate configuration permits the stack to be started up and operated without sensitivity to thermal gradients and mechanical stresses.